06-14-2011, 08:37 PM | #1 |
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Engine Noise of 28i
So I thought I had read the the engines of the X3's aren't too quiet, even at idle. When I start mine in the mornings, it's not super quiet, and has a slight rattling noise (if you can even call it that - doesn't seem like anything is wrong though).
I have a 28i and wondering if anyone's engine also isn't entirely quiet or does it eventually 'quiet down' over use? |
06-14-2011, 08:53 PM | #2 |
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Mine's a 35i, but when warm the idle is quiet enough that with the most minor of ambient noise (grocery parking lot in the 'burbs) I need to sometimes poke back inside and check the tac to see if I turned it off -- a couple times I hadn't! Not at all quiet when cold, though.
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06-14-2011, 09:13 PM | #3 |
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I think I might know what you mean by that "rattle," Flash. There seems to be a really pronounced metallic-like rattle especially during cold start. There's also a metal click when you turn off the engine, I'm not sure if it's related, have you heard it with the 28i?
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06-14-2011, 09:17 PM | #4 |
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I have yet to hear any metal click but just like a constant metallic rattle in the engine, and nothing that is alarming me, but I just thought the engine would be quieter, for a BMW.
I don't recall listening so much to the engines during my test drives but just wanted to see if others are also not hearing a quiet engine, per say. I heard it the first time I picked up the car and the dealer said multiple times it was normal in these cars, and I do remember reading somewhere on this very forum too. |
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06-14-2011, 09:24 PM | #5 |
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This is gonna sound a bit wacky, but when I accelerate from a stop with the driver's window open and near a wall on that same side, it sounds very "rattly" -- metallic, loose bits moving around. Anything like what you're hearing?
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06-14-2011, 09:40 PM | #6 | |
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I hear the noise when I first start the engine or when I go check my mail, and have the car still running. It's a very slight rattle sound. |
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06-14-2011, 09:42 PM | #7 |
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I would said my 28i is very quiet except when cold start.....
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06-14-2011, 09:43 PM | #8 |
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Mine didn't have anything like that.....
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06-15-2011, 08:06 AM | #9 |
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06-15-2011, 08:46 AM | #10 |
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You're probably hearing the sound of the high pressure injectors. These cars use direct injection into the cylinders (like a diesel) instead of the "older" port injection. This results in about a 10% efficiency gain (better gas mileage) but requires that the fuel injectors operate at a much higher pressure and also open and close much faster (than the "old-style" injectors) because of the critical timing requirements.
The injectors are piezo-electric instead of magnetic and generate a small, audible click when triggered. The sound is not as loud as that of a bad valve lifter, but has much higher frequency components. If you're hearing it, it only means that your high-frequency hearing is still pretty good, or that you're in a garage which is reflecting the sound and making it more noticeable. The solution is to drive the car harder. The exhaust noise will drown out the injector "clicking". |
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06-15-2011, 05:35 PM | #13 |
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06-16-2011, 09:39 AM | #14 |
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mine is also quite enough...though I must say, I am not that sensitive to engine sounds in general...
hey you want noise? I've got a 2011 Chevi Equinox! Boy you should try that one! Don't forget earpads though!!! |
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06-16-2011, 10:05 AM | #15 | |
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Thanks Lotus. So I guess the solution is to go to a few more rock concerts to take care of that high frequency hearing problem. |
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06-16-2011, 03:44 PM | #16 | |
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*got to be P.C. |
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06-16-2011, 04:40 PM | #17 |
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No, it will become the "Who" me generation, as in "Who me, you talkn' to me". What's funny is that a lot are going to vinyl. Just set my 20 something daughter up with my dad's old Miracord turntable and Bose computer speakers.
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06-21-2011, 01:20 PM | #18 |
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I get the rattle on cold start on my 35i as well. It was a bit disconcerting at first, but come to think of it my 2010 335i that I just traded in also had something similar, wasn't really a smooth idler either for that matter. Oh well, I'll get used to it I guess.
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10-29-2011, 07:13 AM | #20 | |
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Engine noise
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Hi Nahoa, I think you have hit the nail on the head with your explanation of my problem since day one. When sitting next to a wall it sounds like the motor is actually a diesel... makes me crazy. I brought it to the dealer but of course... no problem. I like the explanation of the direct injection but still not 100% convinced. Have you brought yours into the dealer? Thanks! |
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10-29-2011, 07:56 AM | #21 |
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X3Killer,
See my post (#9) from this thread: http://x3.xbimmers.com/forums/showth...t=engine+noise Had these 2 caps installed and that 'diesel' or rattling noise is now gone. Dave
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